From: Mark Dickinson <dickinsm@gmail.com>
Date: Sun, 15 Nov 2009 12:56:08 +0000 (+0000)
Subject: Fix another case of potential signed overflow.
X-Git-Tag: v3.2a1~2178
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b43dbc26f9abbd6bf96bd95e6701719575c57341;p=python

Fix another case of potential signed overflow.
---

diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
index cabe785256..ec75c8fcfe 100644
--- a/Objects/rangeobject.c
+++ b/Objects/rangeobject.c
@@ -411,7 +411,10 @@ static PyObject *
 rangeiter_next(rangeiterobject *r)
 {
     if (r->index < r->len)
-        return PyLong_FromLong(r->start + (r->index++) * r->step);
+        /* cast to unsigned to avoid possible signed overflow 
+           in intermediate calculations. */
+        return PyLong_FromLong((long)(r->start +
+                                      (unsigned long)(r->index++) * r->step));
     return NULL;
 }